Friction draft-rigging.



C. J. NASH.

FRICTION DRAFT RIGGING.

APPLICATION FILED AUG. 19, 1907. 93 1 ,955 Patented Aug. 24, 1909.

2 SHEETSSHEET l.

@iwJ/w Jiiarzzg-s 0. J. NASH. I FRICTION DRAFT RIGGING. APPLICATION FILED AUG. 19 1907.

ASSIGNOR TO W. H. MINER COMPANY, OF CHICAGO,

CHARLES J'. 'NASH, OF CHICAGO, ILLINOIS,

ILLINOIS, A CORPORATION OF ILLINOIS.

FRICTION DRAFT-RIGGING.

Specification of Letters Patent.

Application filed August 19, 1907.

Patented A11 24, 1909. Serial No. 389,162.

T 0 all whom it may concern:

Be it known that 1, CHARLES J. NASH, :1

Illinois, have invented a new and useful lnrprovementin Frlction Draft-Rigging, of which the following s a specification.

My invention relates to friction draft rigging for railway cars.

The OlJJGGt of my invention is to provide a friction spring draft rigging of a simple,

strong. safe. etlicient and durable construction, having both a di'ect acting spring cushioning member longuicliiially arranged in'the line of the draw bar, and frictional cushioning devices with longitudinally extending friction faces parallel to the draw bar in which the frictional devices will operate with certainty and uniformly, smoothly, evenly and with regularity and reliability, both in compressing and releasing and without danger of sticking, and by means .of which the objections heretofore experienced in the practical operation of friction draft rigging may be overcome.

To practically accomplish this result, and herein my invention consists, I combine with the draw bar, followers, front, rear and intermediate stops, the spring and friction devices, (the latter comprising a longitudinally movable friction shell. friction blocks within the shell, and a wedge or spreader block and anti-friction rollers interposed between the wedge and friction blocks). a movable follower block which is interposed between the spring and the rear-follower, so that 2 limited preliminary compression of the spring.

may take place before the longitudinally movable friction shell engages the rear follower, and so that in releasing a slight expansion of the spring may take place without necessitatingthc movement of the friction devices in respect to each other. By the combination of these parts together I have discovered 'anddemonstrated V by my experiments that the objections and difficulties heretofore experienced in the practical operation of friction spring draft rigging may be efiectually overcome.

In the accompanying drawing, forming a part of this specification, Figure 1 is a central vertical longitudinal section of a direct acting friction spring draft rigging embodying my invention; Fig. 2 isa. plan view. partly in horizontal section; Fig. 3 is a vertical cross section on line 3-3 of Fig. 1; Fig. a a detail cross section of the friction shell; citizen of the lfnited States, residing in Chicago, in the county of Cook and State of Fig, 5 is a detail face or plan View of the wedge or spreader block, and Fig. 6 is a detail face or plan view of one of the friction blocks. I

In the drawing A represents the center sills orother frame pieces of' the car to which the draft rigging is applied.

B is the draw bar, B its yoke, C a longitudinally arranged direct acting draft rigging springx' D D front and rear stops, D D intermediate stops, E front and rear followers.

F is the longitudinally movable friction shell, preferably cylindrical in forin, having an interior longitudinally extending friction face 7'; and G G are longitudinally inovable friction blocks within the shell F and having longitudinally extending exterior friction faces 9 g in sliding frictional engagement with the interior friction face of the friction shell F.

G is the wedge between the friction blocks (r G. The friction blocks G have inclined or wedging faces g which cooperate with the corresponding inclined orwedging faces g of the wedge G and the interposed friction rollers H. which have a rolling contact on the wedging faces t of both the friction blocks G G and the wedge G to prevent any tendency of the wedges and friction blocks from sticking. The friction blocks G G are also furnished with curved shoulders g which cooperate with corresponding shoal. dcrs g on the wedge Gr to hold or keep the anti-friction rollers H H in place while permitting the same to roll freely on the inclined or wedging faces g g of the friction blocks G and wedge G The friction blocks- G are further provided with retaining shoulders g which engage a transve 'sely extending pin or rivet K secured to the friction, shell F and adapted to engage said shoulders g on the friction blocks G when the spring 0 is expanded to its full extent, thus preventing the friction bloc ks G from being entirely removed from the friction shell F. The cooperating shoulders g on the wedge G which engage the anti-friction rollers H in connection with the roller engaging shoulders g on the friction blocks also hold the Wedge G in its assembled position withinthe shell F. The friction blocks G and wedge G are also preferably furnished with end of the spring, and projecting through and closing the rear end of the friction shell F. The bearing block 15 is movable in respect to the friction shell F to a limited extent, so as to provide for limited preliminary compression of the spring 0 before the friction devices come into action. The movable bearing block F is furnished with a flange,

or shoulder f engaging a corresponding flange or shoulder f at the rear end of the friction shell F; I

To strengthen the friction shell it is provided with circular ribs and longitudinal guide ribs f, f f f, the upper and lower longitudinal ribs f f engaging the draw bar yoke, and the upright or side longltudinal ribs f f engaging or fittin external guides 03 05, one on eac side, which are secured to or form part of the intermediate stops D D 1 In the drawing I have illustrated the front and rear stops D D in separate pieces from the intermediate stops D D but all these stops or abutment shoulders may be made in one stop casting, if preferred. The friction blocks G preferably have chilled or hardened portions g 'extending preferably to the depth of a quarter of an inch or such matter from the friction faces and wearing portions of the friction blocks. As each friction block G has only one stop or roller engaging shoulder for the anti-friction roller.

H, the roller is thus free to turn with a rollv ing action or movement on the friction block; and as the cod crating-wedge block G also has on .each 0 its inclined or wedgin faces only one stop shoulderafor the ro ler H to engage, it leaves the roller free to turn with a rolling movement on the inclined or wedging faces of the wedge also. The rollers-H H thus have a true rolling or anti-friction action in cooperation with the wedge and friction blocks, and thus cause the friction devices to act with certainty and efficiency and reliability and without danger of sticking, and as intermediate stopsare provided to limit the movement of the followers and the compression of the springs independent of the longitudinally movable friction shell F, this friction shell is entirely relieved and protected from the blows of the draw bar and prevented from being upset, compressed or shortened in length thereby.

M is the lower tie or guide plate which supports and guides the friction shell as well as the draw bar extension or yoke 13- and the draft rigging as a whole. Thistie or'guide plate is preferably furnished with a central longitudinal channel on to receive the lower limb or member of the draw bar;

between the yoke, which receives, supports and guides the friction shell F. The tie plate M also has wings or flanges m provided with shoulders m to engage the lower flanges a of the center sills or other stationary parts to which the guide or tie plate M is secured by its bolts m The wedge faces or inclines g on the friction blocks and g g on the wedge block G are preferably at angles of about forty-five degrees.

The movable follower or bearing block F preferably is constructed to give about onehalf inch play between the rear follower D and the rear end of the friction shell F, thus providing for a one-half inch preliminary compression of the spring before the friction devices come into action under either pulling or bufling strains, or in releasing. By this cooperative combination of parts I secure all the advantages of the friction resistance mechanism in giving high capacity to the draft rigging, and in enabling it to adequately cushion the heavy bufling and pulling blows or strains, while at the same time the draft rigging has greater sensitiveness in cushioning or taking care of the slighter variations of stress or strain which are very numerous and constantly occurring while the train is in motion, and the further important advantage of relieving the friction mechanism from a great amount of unnecessary wear due to the numerous and constantly occurring minorvariations in strain or stress.

I do not claim as my invention the drawbar, stops, followers, spring, friction shell, friction blocks, wedge and antifriction rollers on each side of the wedge, except in com-- bination with the preliminary compressionblock F.

I claim:

1. In afriction draft rigging, the combination with the draw bar and direct acting spring in line with the draw bar, of friction devices in line with the draw bar comprising a friction shell and friction blocks within the shell having wedging faces, an antifriction roller havinga rolling action on both members between which it is interposed, and means. for affording a preliminary compression of the spring before the friction devices come into action, said preliminary compression means coacting with said roller to prevent sticking of the friction devices and in producing certain and reliable release action, substantially as specified.

2. In a friction spring draft rigging, the

combination with the draw bar, spun and followers, of a friction shell, a longitudinally movable wedge block and friction blocks within the shell, anti-friction rollers between the wedge block and friction blocks, each of said rollers having a rolling action on both members with which it contacts, and a movable bearing block between the spring and one of the followers, said movable bearing block coacting with said rollers to prevent sticking of the friction blocks in the friction shell andin producing certain and reliable release action, substantially as specified.

3. In a friction draft rigging, the combination with the draw bar, longitudinally arranged spring, followers and front, rearand intermediate stops for the followers, of a longitudinally movable friction shell surrounding thespring, a movable follower intel-posed between the rear follower and the spring and projecting-throu lithe rear end of said friction shell, longitn inally movable I friction blocks inside said shell, a longitudinally movable wedge block between said :friction blocks, anti-friction rollers between action, substantially as specified. CHARLES J. NASH.

itnesses I EoM i D Aoooon, H. M. MUNDAY.

said Wedge block and said friction blocks,

andin producing certain and reliable release 

